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Company Profile Established in 2003 and based in Ningbo’s Zhenhai District, Ningbo Zhongli Bolt Manufacturing Co., Ltd. specializes in high-strength fasteners for global industrial applications. With a 10,000 m² production base, an annual capacit...

Fasteners, the fundamental hardware components holding our engineered world together, come in an immense variety of standardized types, grades, and materials. Understanding these classifications is crucial for selecting the right fastener for strength, safety,...

1. Introduction: Industrial Value of Zinc Coating Protection In harsh environments such as Bridges, power towers, and Marine engineering, the anti-corrosion ability of bolts directly determines the structural safety. Galvanizing, as the most economical meta...

When rust prevention becomes a necessity: The industrial survival rule of blackened bolts At the joints of heavy machinery and in the seams of bridge steel structures, blackened bolts are like silent guards. The deep blue-black oxide film (Fe₃O₄) on the...

1. Material genes forge outstanding performance ASTM A193 B7, as a representative of chromium-molybdenum alloy steel, its heat treatment process of quenching + tempering endows the material with unique advantages: Strength indicators: Tensile strength &g...

The manufacturing processes of Hot Forging (热墩 - rè dūn) and Cold Forging (冷墩 - lěng dūn) represent fundamentally different approaches to shaping metal into bolts and fasteners. While both fall under the umbrella of forging (墩锻 - d...

Flange face bolts, as key components in the field of mechanical connections, their innovative design and performance optimization are profoundly influencing the manufacturing processes and product reliability in the automotive industry. From traditional fuel...

In the home furnishing industry, although hardware accessories may seem insignificant, they are the key to ensuring the stability and durability of furniture. Hex socket bolts, as a common type of fastener, are widely used in the assembly and customization o...

1.Breakthroughs in materials technology under harsh environments In oil pipeline projects, high-strength bolts such as NW2201 are made of chromium-molybdenum alloy steel (like 35CrMo), with tensile strength reaching over 1000MPa and a yield-to-tensile ratio...

DIN 933 bolts are a type of fully threaded hexagon head bolt standardized under the German Institute for Standardization (Deutsches Institut für Normung, or DIN). These bolts are widely recognized in mechanical engineering, construction, automotive indust...